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Media: Add support for rendering PDF thumbnails.

Browse Source 
When support for PDFs is available, on upload,
render 'Thumbnail', 'Medium', 'Large', and 'Full' sizes of
the first page, and save them in attachment meta.

Use these renders within Add Media, Media Gallery and List views,
Attachment Details, Post/Attachment Edit screens, and Attachment pages.

Support available by default via Imagick -> ImageMagick -> Ghostscript,
but can be provided by any `WP_Image_Editor` that supports PDFs.

Props adamsilverstein, azaozz, celloexpressions, desrosj, dglingren, ericlewis, ipstenu, joemcgill, joyously, markoheijnen, melchoyce, mikeschroder, tomauger.
Fixes #31050.

git-svn-id: https://develop.svn.wordpress.org/trunk@38949 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Mike Schroder
2016-10-26 07:27:51 +00:00
parent 16bfeb6608
commit 35e6dbe14f
7 changed files with 163 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/wp-admin/includes/image.php
+41 -1
View File
@@ -76,7 +76,9 @@ function wp_generate_attachment_metadata( $attachment_id, $file ) {
$metadata = array();
$support = false;
if ( preg_match('!^image/!', get_post_mime_type( $attachment )) && file_is_displayable_image($file) ) {
$mime_type = get_post_mime_type( $attachment );
if ( preg_match( '!^image/!', $mime_type ) && file_is_displayable_image( $file ) ) {
$imagesize = getimagesize( $file );
$metadata['width'] = $imagesize[0];
$metadata['height'] = $imagesize[1];
@@ -201,6 +203,44 @@ function wp_generate_attachment_metadata( $attachment_id, $file ) {
}
}
}
// Try to create image thumbnails for PDFs
else if ( 'application/pdf' === $mime_type ) {
$editor = wp_get_image_editor( $file );
$fallback_sizes = array(
'thumbnail',
'medium',
'large',
);
$sizes = array();
foreach ( $fallback_sizes as $s ) {
$sizes[$s]['width'] = get_option( "{$s}_size_w" );
$sizes[$s]['height'] = get_option( "{$s}_size_h" );
// Force thumbnails to be soft crops.
if ( ! 'thumbnail' === $s ) {
$sizes[$s]['crop'] = get_option( "{$s}_crop" );
}
}
if ( ! is_wp_error( $editor ) ) { // No support for this type of file
$uploaded = $editor->save( $file, 'image/jpeg' );
unset( $editor );
// Resize based on the full size image, rather than the source.
if ( ! is_wp_error( $uploaded ) ) {
$editor = wp_get_image_editor( $uploaded['path'] );
unset( $uploaded['path'] );
if ( ! is_wp_error( $editor ) ) {
$metadata['sizes'] = $editor->multi_resize( $sizes );
$metadata['sizes']['full'] = $uploaded;
}
}
}
}
// Remove the blob of binary data from the array.
if ( $metadata ) {